//这个类是用来测试子类构造方法所创建的
//
public class Derived extends Base{
    String B;
    public Derived(String B){
        super("base");
        System.out.println(super.A + " of base in derived");
        this.B = B;
        System.out.println( B + " of derived");
    }
    public Derived(){}
}
